Boat.



H. P. DINESEN.

BOAT.

APPLICATION FILED OCT. 26, 1909.

1,070,878, Patented Aug. 19, 1913.

2 SEEBTS-SHEET 1.

4 F7 0 77NE Ni H. P. DINESEN.

BOAT.

APPLIOATION FILED OUT. 26, l909. 1 1,070,878. Patented Aug. 19, 1913. 2 SHEETS-SHEET 2.

WITNESSES: INYENTORI Fig. 10 is a cross-section on the line FF of Fig. 6. As will be seen the oblique surfaces 10 which, on the one hand, extend from the bow to the stern, and on the other hand descend from the center of the boat outward, will be moved in the water in such a manner that a component of the water pressure will act on the surfaces so as to drive them upward, while another compo; nent (see Fig. 7) will force the water against the center of the boats lines. In the same way, the oblique surface 11 could be provided at the bow end of the boat. As it may be difiicult to get water from the stern end of the boat right to the center it is advisable to lower the bottom 12 in-the center (Fig. 10) whereby the air can be inclosed at the point where the water supply from both sides becomes inadequate. The

propellers will have the tendency to lower the inner water surface forward of them and to raise it slightly aft. When the propellers are properly placed, that will contribute to raising the water line at the stern end, and thus increase the action.

In the boat of Figs. 11 to 13, a number of oblique surfaces 13 are arranged under the ship, all being inclined toward the stern and toward the ships sides. During the forward propulsion of the boat in the direction of the arrow, the pressure of the water on the oblique surfaces will bring about, on the one hand, an upward raising of the ship, and on the other hand, a movement of the water from the outside under the ship where there is air pressure in the chamber 1a. In that way, it will be possible to keep the water surfaces in the'chamber practically at the same level as the water outside, so that the air pressure resistance in this case can be zero or even negative.

Figs. 14; to 16 show a modifiedconstruction of the bow-portions of the boat. In case of smaller boats and in a heavy sea, it may happen that the fore part of the boat would come out above the water surface, so that the air-from the chamber 14 could escape between the oblique surface and the water. A portion of the air-chamber can, therefore, be constructed with one or more adjustable or hinged plates 15, the lower edge of which edge always follows the water surface and thus prevents the air from escaping. In Fig. 1d the plate 15 is made as rea ers,

a plate of rubber or some other elastic material connected to the ship. In Figs. 15 and 16 the plate 15 consists of one or more hinged plates. It can be arranged to be adjustable automatically for instance, by means of a rod which passes in an air and water tight manner through the ships bot tom with a piston in an airor liquid brake or dash-pot, or with springs for reducing the shocks during the movement. The immersed portion of the bottom at the sternportion can be constructed in a similar manner. In Fig. 16 the front edge of the hinge plate 15 is bent downward and dips into a narrow tank filled with water and arranged transversely of the boat, so that'an air tight joint is obtained by means of a water seal.

In all forms of boats some of the compressed air underthe bottom will be separated and carried away by the water. This air, can, however, be replaced by any well known means.

In the foregoing description and in the claims the word boat should be taken to mean generally any kind of Water vehicle.

I claim as my invention 1. A boat having its bottom formed with an open-bottomed longitudinal air-chamber, and oblique surfaces in said chamber on the bottom of the boat for raising the level of the water in the rear-part of the airchamber.

2. A boat having its bottom formed with an open-bottomed longitudinal air-chamber extending from the bow-portion toward the stern-portion of the boat, and oblique surfaces in said chamber, said surfaces being inclined from the bow toward the stern and from the center toward the sides.

8. A boat having its bottom formed with an open-bottomed longitudinal air-chamber and a cushioned plate hinged to the front wall of the air-chamber and provided with a downwardly-bent and water-sealed upper portion.

In testimony, that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

HANS PE'lFilt DIN ESEN.

Witnesses Fanns'r BoU'rAno, I HQFMANJBANG. 

